1,721,033 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Many Options for Endoscopic Ultrasound-Guided Fine-Needle Aspiration of Pancreatic Masses, but Any Differences?
No full textCold snare polypectomy is a safe and effective technique to remove large, partially circumferenctial duodenal polyps.
No full textIntroduction: Large duodenal polyps, specifically, those greater than 50% luminal circumference are often removed with endoscopic snare cautery, or sometimes surgically. Snare cautery can lead to thermal injury to the duodenal wall, delayed bleeding and perforation and surgical management can lead to significant morbidity. Cold snare polypectomy has been shown to be a safe and effective technique for colon adenomas over 1 centimeter but whether that translates to large adenomas of the duodenum is not clear. Aim: Our aim was to evaluate the efficacy and safety of cold snare technique for large duodenal polyps. Methods: We retrospectively reviewed the charts of all patients undergoing lift and piecemeal cold snare polypectomies by a single endoscopist for duodenal polyps greater than 5 millimeters in size from 2014-2016. Primary endpoints included residual polyp at subsequent endoscopy. Secondary endpoints were number of endoscopies required for polyp eradication, and complication rate. Endpoints were then compared in the greater than and less than 50% circumferential polyps. Results: 19 patients, average age 66.7 years (37% men) underwent lift then piecemeal cold snare polypectomy of 21 polyps. Average polyp size was 29.4 millimeters, with 37% of the polyps taking up over 50% of the luminal circumference. The polyps were most often located at the second portion of the duodenum (47%) with an average of 1.89 endoscopies required to completely eradicate the polyps. Residual polyp was present on subsequent endoscopies in 9 (47%) of all patients, with 5 (56%) of those coming from patients with polyps greater than 50% luminal circumference. The polyps greater than 50% luminal circumference were significantly larger (p\u3c0.005), more often had a villous component or high-grade dysplasia (p=0.09) and required more endoscopies for eradication (2.6 vs 1.6, p=0.08). Four patients(21%) developed strictures, three of those coming from the greater than 50% luminal circumference polyps. Notably, there were no perforations and none of the patients required surgery. There was one post-polypectomy bleed (5%); it was immediate and treated with hemoclips. There was no delayed post-polypectomy bleeding. Argon plasma coagulation (APC) was more often used during resections of the greater than 50% circumferential polyps (43% vs 8%, p\u3c0.05). Conclusion: In our small sample, cold snare lift then piecemeal polypectomy is safe and effective at removing duodenal polyps both greater than and less than 50% luminal circumference. (Table Presented)
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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